Process of producing resists in dyeing with vat dyestuffs



Patented Got. 1, P929 tra n JULIUS HOPKER, OF SODEN-ON-THE-TAUNUS, GERMANY, ASSIGNOR TO GENERAL ANI- LINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE PROCESS OF PRODUCING RESISTS IN DYEING WITH VAT DYESTUFFS No Drawing. Application filed April 30, 1928, Serial No. 274,170, and in Germany May 6, I927.

The present invention relatesto the production of resists in dyeing with vat dyestufi's. I

I have found that resists in dyeing with rat dyestull's can be easily produced by printingr upon the material an oxidizing? agent, such as for instance sodium meta-nitro-benzeuesultonate or sodium bichromate or a mixture of both these salts with an aqueous solution of an alkyl ether of cellulose, drying the material and then dyeing it in the usual manner in the hot dyeliquor of a vat dyestull'. Printing colors thus prepared can be easily applied and yield good resist efl'eets because the alkyl others of cellulose are completely precipitated on the fiber even by'a small quantity of the alkali, particularly ow iug to the elevated temperature of the vatdye liquor.

There have already been used oxidizing agents in a preparatmy printing process in order to produce rcsists'in a subsequent printing process with Vfli dyestuii's, but resist agents obtained by means of the hitherto available thickening agents could not be used for dyeing with vat dyestufi's because the thickening agents while being in the hot dyeliquor are detached from the fiber.

The following examples serve to illustrate my invention but are not intended to limit it thereto: I

1. A resist printing paste is prepared as follows:

QoO gr. or a 15% aqueous solution or cellulose methyl ether are mixed and stirred with gr. of cold water and there are then introduced gr. sodium meta-nitro-benzenesulfonate into gr. water 1 kgr.

The paste thus prepared is printed on the u iaterial which is then dried and dyed at 79 C. in a- Vat liquor prepared with the following ingredients of 5.7.5.7-tetrabromindigo paste 20% caustic soda solution of B.

of hydrosulfite concentrated powder the whole being made up to 1 liter.

The material, after being dyed, is washed, soaped, and dried.

2. A resist printing paste is prepared as follows gr. of a 15% solution of cellulose methyl other are mixed with 250 gr. of cold water and there is then added a solution of gr; of sodium bichromate in gr. of water 1 kgr.

The paste thus prepared'is printed on the material which is then dried and dyed at 78 C. in a vat-liquor prepared with the t'ollow-.

in g ingredients 1 liter.

The material, after being dyed, is washed, soaped at the boil, rinsed and dried.

iii)

3. A \i'hite-resist printing paste (1) is prepared as follows:

1 kgr.

The paste thus prepared is printed on the material which is then dried and dyed at C. in a vat-liquor prepared with the following ingredients:

30 gr. of 5.7.5.7-tet.ral:n.'0niindigo paste 900 of hot water 40 gr. of caustic soda solution of 40 Be. 16 gr. of hydrosullite conc. powder the whole being made up to 1 liter.

The material, after being dipped into the above liquor for 20 seconds, is washed, soaped, rinsed and dried.

1. A white-resist printing paste (I1) is prepared as follows:

250 gr. of 115% aqueous solution of cellulose methylcther are mixed with 250 gr. of cold water and there is then added a solution of 200 gr. of sodium bichroinate in 300 gr. of water 1 kgr.

The paste thus prepared is printed on the material which is then dried and dyed at 78 C. in a vat-liquor prepared with the following ingredients:

30 gr. of N-dihydro-12.1.2-anthraquinone azine paste gr. of caustic soda solution of 30 Be.

gr. of boiling water gr. of glycose (1: 1)

gr. of hydrosullite concentrated powder the whole being made up to 500 ;gr. of the white-resist printing paste (1) obtainable according to Example 3 are mixed with 500 gr. oi the white-resist printing paste (II) obtainable according to Example 4:.

The paste thus prepared isprinted on the material, dried and dyed at 78 CI in a Vat liquor prepared with the following ingredicuts:

30 gr. of N-dihydro-1-2-1-2'-antliraquinone azine paste 100 gr. of caustic soda solution of 80 B. 600 gr. of boiling Water 70 gr. otglycose (1:1) 16 gr. of hydrosullite concentrated powder the whole being made up to .1 liter.

1 kgr.

the said diazotized base being prepared by means of 10 gr. ot' 5-chloro- -amino1-toluene, 20 gr. of water, 11 com. of hydrochloric acid of 20 136., 70 gr. of ice and. water and 1,2 gr. or sodium nitrite, the whole being made up to 110 com.

The paste thus prepared is printed on the material previously treated with a naphtholpreparation which may be obtained by making 20 gr. of B-hydroxy naphthoic acid-5- ehlor-2 toluidide into a paste with 20 gr. of sodium Turkey red oil (50%) adding thereto 80 com. of caustic soda solution of 3 1 B. and making up the whole with hot Water to one liter.

The material is then well dried and dyed at 78 C. in a Vat-liquor prepared with the following ingredients:

30 gr; of N-dihydro-1.2.1.2-anthraquinone azine paste v gr. of caustic soda solution of 30 B6. 600 gr. of boiling Waterl.

70 gr. of glycose (1:1) 16 gr. of hydrosulfite concentrated powder the Whole being made up to 1 liter.

Thematerial, after being dipped into the above liquor for 20 seconds, is washed, soapcd at boiling temperature rinsed hot and dried.

an oxidizing agent and an aqueous solution I JULIUS HoPKER. 

